Hi\u1ec7n nay vi\u1ec7c ti\u00eau th\u1ee5 \u0111i\u1ec7n l\u00e0 nhu c\u1ea7u thi\u1ebft y\u1ebfu c\u1ee7a cu\u1ed9c s\u1ed1ng. Vi\u1ec7c l\u1ef1a ch\u1ecdn d\u00e2y d\u1eabn \u0111i\u1ec7n sao cho ph\u00f9 h\u1ee3p v\u1edbi t\u1eebng m\u1ee5c \u0111\u00edch s\u1eed d\u1ee5ng l\u00e0 r\u1ea5t quan tr\u1ecdng. B\u00e0i vi\u1ebft h\u00f4m nay onthitot.com c\u00f9ng c\u00e1c b\u1ea1n xem l\u1ea1i c\u00f4ng th\u1ee9c t\u00ednh ti\u1ebft di\u1ec7n d\u00e2y d\u1eabn \u0111i\u1ec7n 3 pha v\u00e0 \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c n\u00e0y v\u00e0o th\u1ef1c t\u1ebf \u0111\u1ec3 c\u00f3 l\u1ef1a ch\u1ecdn d\u00e2y d\u1eabn sao cho ph\u00f9 h\u1ee3p nh\u1ea5t.<\/p>\n

1\/ C\u00f4ng th\u1ee9c t\u00ednh ti\u1ebft di\u1ec7n d\u00e2y d\u1eabn \u0111i\u1ec7n 3 pha<\/h2>\n

\u00a0I= S . J<\/strong><\/p>\n

Trong \u0111\u00f3:<\/p>\n

\n
• I: l\u00e0 c\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n. \u0110\u01a1n v\u1ecb t\u00ednh b\u1eb1ng A<\/li>\n
• S: l\u00e0 ti\u1ebft di\u1ec7n c\u1ee7a d\u00e2y d\u1eabn. \u0110\u01a1n v\u1ecb t\u00ednh mm\u00b2<\/li>\n
• J: l\u00e0 m\u1eadt \u0111\u1ed9 c\u1ee7a d\u00f2ng \u0111i\u1ec7n cho ph\u00e9p ch\u1ea1y qua.<\/li>\n<\/ul>\n

  <\/p>\n

  2\/ \u00c1p d\u1ee5ng c\u00f4ng th\u1ee9c t\u00ednh ti\u1ebft di\u1ec7n d\u00e2y d\u1eabn<\/h2>\n

  \u00c1p d\u1ee5ng c\u00f4ng th\u1ee9c t\u00ednh ti\u1ebft di\u1ec7n d\u00e2y d\u1eabn \u0111i\u1ec7n v\u1edbi \u0111i\u1ec7n sinh ho\u1ea1t:<\/h3>\n

  \u0110\u1ed1i v\u1edbi \u0111i\u1ec7n sinh ho\u1ea1t c\u00f3 hi\u1ec7u \u0111i\u1ec7n th\u1ebf l\u00e0 220V ta c\u00f3:<\/p>\n

  Ch\u1eb3ng h\u1ea1n ta c\u00f3 t\u1ed5ng c\u00f4ng su\u1ea5t c\u1ee7a c\u00e1c thi\u1ebft b\u1ecb s\u1eed d\u1ee5ng \u0111i\u1ec7n trong gia \u0111\u00ecnh l\u00e0 5kW ta t\u00ednh nh\u01b0 sau:<\/p>\n

  – C\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n t\u1ed5ng I = P \/ U = 5000 \/ 220 = 22.7 A<\/p>\n

  – V\u1eady ta c\u1ea7n ch\u1ecdn ti\u1ebft di\u1ec7n d\u00e2y d\u1eabn l\u00e0: S = 22.7 \/ 6 = 3.78 mm^{2<\/sup><\/p>\n}

  – V\u1eady ta \u00a0n\u00ean ch\u1ecdn ti\u1ebft di\u1ec7n d\u00e2y d\u1eabn l\u00e0: 4mm^{2<\/sup><\/p>\n}

  – \u0110\u1ec3 \u0111\u1ea3m b\u1ea3o theo t\u1eebng y\u00eau c\u1ea7u s\u1eed d\u1ee5ng ta ch\u1ecdn S = 1,75 . 3,78 = 6.615 mm^{2<\/sup>. v\u1eady ta c\u1ea7n ch\u1ecdn d\u00e2y d\u1eabn c\u00f3 ti\u1ebft di\u1ec7n 6 mm2<\/sup> \u0111\u1ec3 d\u1ef1 ph\u00f2ng tr\u01b0\u1eddng h\u1ee3p th\u00eam t\u1ea3i l\u00e0m d\u00e2y d\u1eab \u0111\u1ec3 c\u1ea5p ngu\u1ed3n ch\u00ednh.<\/p>\n}

  – \u0110\u1ed1i v\u1edbi d\u00e2y d\u1eabn c\u1ea5p ngu\u1ed3n nh\u00e1nh \u0111i t\u1eebng t\u1ea7ng \u00a0t\u00f9y theo m\u1ee9c \u0111\u1ed9 s\u1eed d\u1ee5ng \u0111i\u1ec7n m\u00e0 ta ch\u1ecdn: chia t\u1ea3i theo t\u1ea7ng ta ch\u1ecdn ti\u1ebft di\u1ec7n 4 mm^{2<\/sup>, c\u1ea5p ngu\u1ed3n cho \u1ed5 c\u1eafm ta ch\u1ecdn d\u00e2y 2,5 mm2<\/sup>, v\u00e0 d\u00e2y chi\u1ebfu s\u00e1ng ta ch\u1ecdn 1 – 1,5mm2<\/sup>.<\/p>\n}

  \u00c1p d\u1ee5ng c\u00f4ng th\u1ee9c t\u00ednh ti\u1ebft di\u1ec7n d\u00e2y d\u1eabn \u0111i\u1ec7n 3 pha: 380V<\/h3>\n

  <\/p>\n

  1 thi\u1ebft b\u1ecb \u0111i\u1ec7n 3 pha c\u00f3 c\u00f4ng su\u1ea5t l\u00e0 l\u00e0 10 kW ta c\u00f3:<\/p>\n

  C\u01b0\u1eddng \u0111\u1ed9 d\u00f2ng \u0111i\u1ec7n t\u1ed5ng l\u00e0:\u00a0 I = P \/ U = 10000 \/ 380 = 26,3 A<\/p>\n

  Ti\u1ebft di\u1ec7n d\u00e2y d\u1eabn l\u00e0 S = 26,3 \/ 6 = 4,4 mm^{2<\/sup><\/p>\n}

  V\u1eady ta c\u1ea7n ch\u1ecdn d\u00e2y d\u1eabn c\u00f3 ti\u1ebft di\u1ec7n l\u00e0 5mm^{2<\/sup><\/p>\n}

   <\/p>\n","protected":false},"excerpt":{"rendered":"

  Hi\u1ec7n nay vi\u1ec7c ti\u00eau th\u1ee5 \u0111i\u1ec7n l\u00e0 nhu c\u1ea7u thi\u1ebft y\u1ebfu c\u1ee7a cu\u1ed9c s\u1ed1ng. Vi\u1ec7c l\u1ef1a ch\u1ecdn d\u00e2y d\u1eabn \u0111i\u1ec7n sao cho ph\u00f9 h\u1ee3p v\u1edbi t\u1eebng m\u1ee5c \u0111\u00edch s\u1eed d\u1ee5ng… <\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[417,446],"tags":[],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/onthitot.com\/wp-json\/wp\/v2\/posts\/8302"}],"collection":[{"href":"https:\/\/onthitot.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/onthitot.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/onthitot.com\/wp-json\/wp\/v2\/users\/9"}],"replies":[{"embeddable":true,"href":"https:\/\/onthitot.com\/wp-json\/wp\/v2\/comments?post=8302"}],"version-history":[{"count":0,"href":"https:\/\/onthitot.com\/wp-json\/wp\/v2\/posts\/8302\/revisions"}],"wp:attachment":[{"href":"https:\/\/onthitot.com\/wp-json\/wp\/v2\/media?parent=8302"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/onthitot.com\/wp-json\/wp\/v2\/categories?post=8302"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/onthitot.com\/wp-json\/wp\/v2\/tags?post=8302"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}